/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.tribes.group.interceptors;

import org.apache.catalina.tribes.group.ChannelInterceptorBase;
import org.apache.catalina.tribes.Member;
import java.util.ArrayList;
import org.apache.catalina.tribes.group.AbsoluteOrder;
import org.apache.catalina.tribes.ChannelException;
import org.apache.catalina.tribes.Channel;

public class StaticMembershipInterceptor extends ChannelInterceptorBase {
	protected ArrayList members = new ArrayList();
	protected Member localMember = null;

	public StaticMembershipInterceptor() {
		super();
	}

	public void addStaticMember(Member member) {
		synchronized (members) {
			if (!members.contains(member))
				members.add(member);
		}
	}

	public void removeStaticMember(Member member) {
		synchronized (members) {
			if (members.contains(member))
				members.remove(member);
		}
	}

	public void setLocalMember(Member member) {
		this.localMember = member;
	}

	/**
	 * has members
	 */
	public boolean hasMembers() {
		return super.hasMembers() || (members.size() > 0);
	}

	/**
	 * Get all current cluster members
	 * 
	 * @return all members or empty array
	 */
	public Member[] getMembers() {
		if (members.size() == 0)
			return super.getMembers();
		else {
			synchronized (members) {
				Member[] others = super.getMembers();
				Member[] result = new Member[members.size() + others.length];
				for (int i = 0; i < others.length; i++)
					result[i] = others[i];
				for (int i = 0; i < members.size(); i++)
					result[i + others.length] = (Member) members.get(i);
				AbsoluteOrder.absoluteOrder(result);
				return result;
			}// sync
		}// end if
	}

	/**
	 * 
	 * @param mbr
	 *            Member
	 * @return Member
	 */
	public Member getMember(Member mbr) {
		if (members.contains(mbr))
			return (Member) members.get(members.indexOf(mbr));
		else
			return super.getMember(mbr);
	}

	/**
	 * Return the member that represents this node.
	 * 
	 * @return Member
	 */
	public Member getLocalMember(boolean incAlive) {
		if (this.localMember != null)
			return localMember;
		else
			return super.getLocalMember(incAlive);
	}

	/**
	 * Send notifications upwards
	 * 
	 * @param svc
	 *            int
	 * @throws ChannelException
	 */
	public void start(int svc) throws ChannelException {
		if ((Channel.SND_RX_SEQ & svc) == Channel.SND_RX_SEQ)
			super.start(Channel.SND_RX_SEQ);
		if ((Channel.SND_TX_SEQ & svc) == Channel.SND_TX_SEQ)
			super.start(Channel.SND_TX_SEQ);
		final Member[] mbrs = (Member[]) members.toArray(new Member[members
				.size()]);
		final ChannelInterceptorBase base = this;
		Thread t = new Thread() {
			public void run() {
				for (int i = 0; i < mbrs.length; i++) {
					base.memberAdded(mbrs[i]);
				}
			}
		};
		t.start();
		super.start(svc & (~Channel.SND_RX_SEQ) & (~Channel.SND_TX_SEQ));
	}

}